/**
 *    Copyright (C) 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once

#include <set>
#include <vector>

#include "mongo/db/global_environment_experiment.h"
#include "mongo/util/concurrency/mutex.h"


namespace mongo {

    class GlobalEnvironmentMongoD : public GlobalEnvironmentExperiment {
    public:
        GlobalEnvironmentMongoD();

        ~GlobalEnvironmentMongoD();

        StorageEngine* getGlobalStorageEngine();

        void setGlobalStorageEngine(const std::string& name);

        void registerStorageEngine(const std::string& name,
                                   const StorageEngine::Factory* factory);

        void setKillAllOperations();

        void unsetKillAllOperations();

        bool getKillAllOperations();

        bool killOperation(unsigned int opId);

        void registerKillOpListener(KillOpListenerInterface* listener);

        void registerOperationContext(OperationContext* txn);

        void unregisterOperationContext(OperationContext* txn);

        void forEachOperationContext(ProcessOperationContext* procOpCtx);

        OperationContext* newOpCtx();

    private:
        bool _globalKill;

        typedef std::set<OperationContext*> OperationContextSet;

        mongo::mutex _registeredOpContextsMutex;
        OperationContextSet _registeredOpContexts;

        // protected by Client::clientsMutex
        std::vector<KillOpListenerInterface*> _killOpListeners;

        // logically owned here, but never deleted by anyone.
        StorageEngine* _storageEngine;

        // All possible storage engines are registered here through MONGO_INIT.
        std::map<std::string, const StorageEngine::Factory*> _storageFactories;
    };

}  // namespace mongo
